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KLUČÁKOVÁ, M. PEKAŘ, M.
Original Title
Solubility and Dissociation of Lignitic Humic Acids in Water Suspensions
Type
journal article - other
Language
English
Original Abstract
Behavior of humic acids extracted from lignite in water suspension was studied by means of potentiometry. Although humic acids are operationally defined as that fraction of humic substances, which is not soluble under acidic conditions, it does not mean that solid preparation easily dissolves in water. Presented results suggest that dissolving of solid humic acids in water environment is more complex than conventional solubility behaviour of sparingly soluble solids. Multi-step mechanism of solid humic acids interaction with water, including partial equilibrium dissolution as well as direct equilibrium dissociation from the solid state, was proposed and proved experimentally. Only very small part of solid humic acids can be dissolved in water and not giving necessarily saturation at the same time. In contrast to common sparingly soluble solids, solid humic phase thus possesses non-constant chemical potential even under constant temperature and pressure and its activity does not equal to unity, in general.
Keywords
humic acid; lignite; dissociation equilibrium; solubility; polyelectrolytes; suspensions;
Authors
KLUČÁKOVÁ, M.; PEKAŘ, M.
RIV year
2005
Released
1. 1. 2005
ISBN
0927-7757
Periodical
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Year of study
252
Number
2-3
State
Kingdom of the Netherlands
Pages from
157
Pages to
164
Pages count
8
BibTex
@article{BUT46220, author="Martina {Klučáková} and Miloslav {Pekař}", title="Solubility and Dissociation of Lignitic Humic Acids in Water Suspensions", journal="Colloids and Surfaces A: Physicochemical and Engineering Aspects", year="2005", volume="252", number="2-3", pages="157--164", issn="0927-7757" }